They are trying to meet a lap-time target. If you can still meet the target, keep the tires. If you can't, swap. Only Mercedes know if they're hitting the times they need with the distance they need on each set. Hamilton is doing decently, but it's dry, can't expect him to keep up with Vettel... Rosberg has been eating tires more than expected due to having to defend.
If the safety car came out, Alonso could immediately pit, put a new set of tyres on and it wouldn't affect their strategy. There's a number of laps - from lap x to lap y - that's referred to as a 'window' where that would apply. In this case it probably means they could make their final pitstop and go to the end of the race on any lap from now on.
LMSCorvetteGT2looks like Alonso passed under yellow, let's see if it comes up any further
No it doesnt work like that. When the leader pits, if you're second you're pitting, it's the best. Beside if you were watching sector time, it was clear that the medium tyre were faster. Why keep Hamilton on track, it makes no sens at all. When you're on the same strategy it makes no sens at all for me.
As for Rosberg, again Super Soft was not a good strategy. Even if he could maybe have done it, it was safer to send him back on medium considering the trouble Mercedes had with tyre. Why do you think that Alonso, Vettel or Webber came back with Medium tyre and not super soft ? If he was on Lotus, Ferrari or Force India, I wouldnt say, but it's Mercedes we're talking about here.
Safety car please. Safety car.
Rosberg's strategy puzzled me. Lewis, I think they are trying to meet a schedule decided on before the race. Vettel is much faster, if they pit behind him, they stay behind him. Only way they can beat Vettel is with an undercut, which is impossible. At this point, they're simply trying to get Lewis to the end of the race on what tires he has.
Uh... Di Resta yet to pit...